Andrena (Rhacandrena) robertsonii Dalla Torre 1896

Gibbs, Jason, Ascher, John S., Rightmyer, Molly G. & Isaacs, Rufus, 2017, The bees of Michigan (Hymenoptera: Apoidea: Anthophila), with notes on distribution, taxonomy, pollination, and natural history, Zootaxa 4352 (1), pp. 1-160 : 27

Andrena (Rhacandrena) robertsonii Dalla Torre 1896

= Andrena (Gonandrena) dreisbachi Mitchell, 1960: 230 (Michigan holotype; Fig. 6C ).

Holotype. ♀ USA: Michigan: Roscommon Co.: 5 Jun. 1955, R.R. Dreisbach ( NMNH: 75177). Synonymy by LaBerge (1977).

County records: Cheboygan, Ionia, Isabella, Lapeer, Lenawee, Livingston, Macomb, Missaukee, Newaygo, Osceola, Ottawa, Roscommon, Shiawassee, Van Buren, Washtenaw.

Notes. Andrena robertsonii is challenging to distinguish from its apparent sister species A. brevipalpis Cockerell ( LaBerge 1977) , which also occurs in Michigan. Mitchell identified specimens of A. robtersonii at MSUC were found to be be A. brevipalpis upon reexamination by JG. It is known Mitchell (1960) misapplied the name leading him to redescribe true robertsonii as dreisbachi ( LaBerge 1977) .

Figures

FIGURE 6. Michigan holotype material at the National Museum of Natural History, Smithisonian Institution. A) Andrena (Gonandrena) monroensis Mitchell, face (= A. platyparia Robertson). B) Andrena (Leucandrena) bifurcata Mitchell, lateral habitus (= A. erigeniae Robertson). C) Andrena (Gonandrena) dreisbachi Mitchell, face (= A. robertsonii Dalla Torre). D) Andrena (? Leucandrena) chippewaensis Mitchell, dorsal habitus (= A. wheeleri Graenicher). Photographs provided with the permission of the National Museum of Natural History, Smithsonian Institution, 10 th and Constitution Ave. N. W., Washington, DC 20560 - 0193. (http: // www. nmnh. si. edu /).